One person blew me away by saying "if you need the feature, why not pay for its development?" I sat there for several minutes, giving them the benefit of the doubt, and I genuinely couldn't think of a way to explain to them how much of a dick they were (apparently unknowingly) being, so I gave up.
But having mulled it for a few more minutes, I think it boils down to:
0) It is *mind-bogglingly* rude to think it's appropriate to have any knowledge or input on a complete stranger's financial situation! And besides that, how do you know I DON'T already contribute financially??
1) I don't have hundreds or possibly thousands of pounds/dollars/euros to spare, and not many people do.
2) Even if I did, when you give Mastodon money it goes to Mastodon as a whole, not particular features being developed.
3) That's not how Mastodon development works, you can't just bribe them into approving and making whatever features you want. Money isn't the obstacle, as was clear in my original post; management don't *want* to do it. (It's one of the more famous reasons why people like Mastodon: they don't just roll over for big money.) (Edit: Although, as we learned above, Mastodon do want to do it actually! But they hadn't read that post, I'm pretty sure.)